src/csharp/Grpc.Core/Internal/SafeHandleZeroIsInvalid.cs

#region Copyright notice and license

// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#endregion

using System;
using System.Runtime.InteropServices;

namespace Grpc.Core.Internal
{
    /// <summary>
    /// Safe handle to wrap native objects.
    /// </summary>
    internal abstract class SafeHandleZeroIsInvalid : SafeHandle
    {
        public SafeHandleZeroIsInvalid() : base(IntPtr.Zero, true)
        {
        }

        public SafeHandleZeroIsInvalid(bool ownsHandle) : base(IntPtr.Zero, ownsHandle)
        {
        }

        public override bool IsInvalid
        {
            get
            {
                return handle == IntPtr.Zero;
            }
        }

        protected override bool ReleaseHandle()
        {
            // handle is not owned.
            return true;
        }
    }
}